Is the maths problem worked out?

somebody worked out the maths problem.改为否定句 初二英语改同义句!He worked out the maths problem in ten minutes. The maths problem is difficult,but f___we work it out. Is ____ easy _____ out the maths problem? The problem is difficult,（ ）he has worked it out. It is difficult () out this maths problem He worked out the math problem f__. I worked out the problem so( )(easy) They worked out the math problem . The way___he worked out the problem is not the way___I told The maths problem is not easy to work out.怎么不可以用is not easy The maths problem is wery easy.They can work it out=The math